Re: [syzbot] BUG: sleeping function called from invalid context in do_page_fault (3)

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit:    a5541c0811a0 Merge branch 'for-next/core' into for-kernelci
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=127e776d880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=cbd4e584773e9397
dashboard link: https://syzkaller.appspot.com/bug?extid=2845b2dfa28dec36e215
compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: arm64
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1578ffdf880000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/4b7702208fb9/disk-a5541c08.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9ec0153ec051/vmlinux-a5541c08.xz
kernel image: https://storage.googleapis.com/syzbot-assets/6f8725ad290a/Image-a5541c08.gz.xz
mounted in repro #1: https://storage.googleapis.com/syzbot-assets/59313e0459cb/mount_0.gz
mounted in repro #2: https://storage.googleapis.com/syzbot-assets/1afee1432fbe/mount_4.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2845b2dfa28dec36e215@xxxxxxxxxxxxxxxxxxxxxxxxx

gfs2: fsid=syz:syz.0:  H: s:?? f:pn e:-32768 p:0 [(none)] preempt_count+0x10/0x24 arch/arm64/include/asm/preempt.h:12
BUG: sleeping function called from invalid context at arch/arm64/mm/fault.c:599
in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 3596, name: syz-executor.0
preempt_count: 0, expected: 0
RCU nest depth: 1, expected: 0
3 locks held by syz-executor.0/3596:
 #0: ffff0000d0712d10 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:766 [inline]
 #0: ffff0000d0712d10 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: open_last_lookups fs/namei.c:3480 [inline]
 #0: ffff0000d0712d10 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: path_openat+0x2e4/0x11c4 fs/namei.c:3711
 #1: ffff80000d4a4640 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x10/0x4c include/linux/rcupdate.h:303
 #2: ffff0000d51feb48 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
 #2: ffff0000d51feb48 (&mm->mmap_lock){++++}-{3:3}, at: do_page_fault+0x1ec/0x79c arch/arm64/mm/fault.c:589
CPU: 1 PID: 3596 Comm: syz-executor.0 Not tainted 6.1.0-rc8-syzkaller-33330-ga5541c0811a0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022
Call trace:
 dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:156
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:163
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x104/0x16c lib/dump_stack.c:106
 dump_stack+0x1c/0x58 lib/dump_stack.c:113
 __might_resched+0x208/0x218 kernel/sched/core.c:9908
 __might_sleep+0x48/0x78 kernel/sched/core.c:9837
 do_page_fault+0x214/0x79c arch/arm64/mm/fault.c:599
 do_translation_fault+0x78/0x194 arch/arm64/mm/fault.c:691
 do_mem_abort+0x54/0x130 arch/arm64/mm/fault.c:827
 el1_abort+0x3c/0x5c arch/arm64/kernel/entry-common.c:367
 el1h_64_sync_handler+0x60/0xac arch/arm64/kernel/entry-common.c:427
 el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:579
 pid_nr include/linux/pid.h:185 [inline]
 dump_holder fs/gfs2/glock.c:2337 [inline]
 gfs2_dump_glock+0x518/0x904 fs/gfs2/glock.c:2447
 gfs2_consist_inode_i+0x68/0x88 fs/gfs2/util.c:465
 gfs2_dirent_scan+0x2dc/0x3b4 fs/gfs2/dir.c:602
 gfs2_dirent_search+0x134/0x494 fs/gfs2/dir.c:850
 gfs2_dir_search+0x58/0x130 fs/gfs2/dir.c:1650
 gfs2_lookupi+0x23c/0x354 fs/gfs2/inode.c:323
 __gfs2_lookup+0x5c/0x1dc fs/gfs2/inode.c:870
 gfs2_atomic_open+0x74/0x148 fs/gfs2/inode.c:1274
 atomic_open fs/namei.c:3276 [inline]
 lookup_open fs/namei.c:3384 [inline]
 open_last_lookups fs/namei.c:3481 [inline]
 path_openat+0x67c/0x11c4 fs/namei.c:3711
 do_filp_open+0xdc/0x1b8 fs/namei.c:3741
 do_sys_openat2+0xb8/0x22c fs/open.c:1310
 do_sys_open fs/open.c:1326 [inline]
 __do_sys_openat fs/open.c:1342 [inline]
 __se_sys_openat fs/open.c:1337 [inline]
 __arm64_sys_openat+0xb0/0xe0 fs/open.c:1337
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall arch/arm64/kernel/syscall.c:52 [inline]
 el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x48/0x140 arch/arm64/kernel/syscall.c:197
 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:584
Unable to handle kernel paging request at virtual address 000003fda9bf7ccd
Mem abort info:
  ESR = 0x0000000096000004
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x04: level 0 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000004